The Jefa upright sheaves contain a housing made of machined aluminium extrusion profile. This housing is much stronger and reliable than casted aluminium housings. The housing can contain a black delrin sheave or an aluminium sheave both with a sealed ball bearing. (For outside use a special version with a stainless ball bearing is available at no surcharge, please note on order). The mounting of the sheave assembly is achieved by 4 off widely spread M8 bolts. The sheave can be rotated up to 13° each side to achieve the correct line up with the steering wire.
The 100 mm diameter sheave sets should be used with 5 mm steering wire. The 140 mm diameter sheaves should be used with 6 mm steering cable. It’s not advisable to use 6 mm cable on the 100 sheaves as the cable will fatigue quickly due to the too small bending radius.
All Jefa open wire sheaves are CE approved. This means that the sheave set will be able to take more loading than the maximum breaking strength of the appropriate steering wire.